Microwave oven



FIG. 1 is a perspective view of the ornamental design of the present invention;

FIG. 2 is a front elevational view of the ornamental design of the present invention;

FIG. 3 is a rear elevational view of the ornamental design of the present invention;

FIG. 4 is a left side elevational view of the ornamental design of the present invention;

FIG. 5 is a right side elevational view of the ornamental design of the present invention;

FIG. 6 is a top plan view of the ornamental design of the present invention; and,

FIG. 7 is a bottom view of the ornamental design of the present invention. 

The ornamental design for microwave oven, as shown. 